MAX17017DEVKit

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General DescriptionThe MAX17017D evaluation kit (EV kit) demonstrates the MAX17017’s standard application circuit. This quad-output converter steps down high-voltage batter-ies and/or AC adapters, generating main supplies for ultra-mobile PCs (UMPCs).The MAX17017D EV kit provides a 5V main stage out-put voltage (VOUTA), a 1.8V VDDQ output voltage (VOUTB), a 1.05V chipset supply output voltage (VOUTC), and a 0.9V VTT output voltage (VOUTD) from a 6V to 16V battery input range. It delivers up to 4A out-put current for the 5V output, 2.5A for the 1.8V output,4A for the 1.05V output, and 1A for the 0.9V output. All outputs are adjustable by changing feedback resistors R5–R10.The MAX17017 also has an internal fixed 5V linear reg-ulator capable of supplying 50mA. The EV kit operates at 0.5MH z (VOUTA and VOUTC) and at 1MH z switch-ing frequency (VOUTB). The EV kit has superior line-and load-transient response.This EV kit is a fully assembled and tested circuit board. It also allows the evaluation of other fixed output voltages by changing resistors R5–R10.Features♦6V to 16V Input Range♦Internal 5V Linear Regulator with 50mA Load Capability ♦Output Voltages5V Up to 4A (VOUTA, Adjustable from 1V to 5.5V)1.8V Up to 2.5A (VOUTB, Adjustable from 0.75V to 4V)1.05V Up to 4A (VOUTC, Adjustable from 0.75V to 4V)0.9V Up to 1A (VOUTD, Adjustable from 0.5V to 2V)♦0.5MHz Switching Frequency (5V and 1.05V Outputs)♦1MHz Switching Frequency (1.8V Output)♦Independent Enable Inputs and Power-Good Outputs ♦Overvoltage and Undervoltage Fault Protection ♦Thermal-Fault Protection♦48-Pin (6mm x 6mm) Thin QFN Package ♦Fully Assembled and TestedEvaluates: MAX17017MAX17017D Evaluation Kit________________________________________________________________Maxim Integrated Products 119-4267; Rev 0; 9/08For information on other Maxim products, visit Maxim’s website at .Ordering Information+Denotes lead-free and RoHS compliant.E v a l u a t e s : M A X 17017MAX17017D Evaluation Kit 2_______________________________________________________________________________________Evaluates: MAX17017MAX17017D Evaluation Kit_______________________________________________________________________________________3Quick StartRecommended EquipmentBefore beginning, the following equipment is needed:•MAX17017 EV kit •6V to 16V, 100W DC power supply•Four dummy loads capable of sinking 4A each •Four digital multimeters (DMMs)•100MHz dual-trace oscilloscopeProcedureThe MAX17017D EV kit is a fully assembled and tested surface-mount board. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed.1)Ensure that the circuit is connected correctly to thepower supply and dummy loads prior to applying any power.2)Set SW1 (1, 10) to the on position (SHDN = VBATT,MAX17017 enabled).Set SW1 (2, 9) to the on position (ONA = VDD,VOUTA enabled).Set SW1 (3, 8) to the on position (ONB = VDD,VOUTB enabled).Set SW1 (4, 7) to the on position (ONC = VDD,VOUTC enabled).Set SW1 (5, 6) to the on position (OND = VDD,VOUTD enabled).3)Connect first DMM across the VOUTA and GNDpads.Connect second DMM across the VOUTB and GND pads.Connect third DMM across the VOUTC and GND pads.Connect fourth DMM across the VOUTD and GND pads.4)Turn on the power supply and adjust input voltageto 12V.5)Verify that the output voltages are VOUTA = 5V,VOUTB = 1.8V, VOUTC = 1.05V, and VOUTD =0.9V.E v a l u a t e s : M A X 17017Detailed Description ofHardware5V Output-Voltage Setting (VOUTA)The MAX17017D EV kit is shipped with FBA connected to resistors R5 and R6, which sets the VOUTA voltage to 5V.To change the output voltage to a value between 1V and 5.5V, remove R5. Calculate R5 using the following equation:R5 = R6 [(VOUTA/VFBA) - 1]where VFBA = 1V and R6 =10k Ω±1%. For an output volt-age of 1V, place a short across R5 and leave R6 open.1.8V Output-Voltage Setting (VOUTB)The MAX17017D EV kit is shipped with FBB connected to resistors R7 and R8, which sets the VOUTB voltage to 1.8V.To change the output voltage to a value between 0.75V and 4V, remove R7. Calculate R7 using the following equation:R7 = R8 [(VOUTB/VFBB) - 1]where VFBB = 0.75V and R8 =10k Ω±1%. For an out-put voltage of 0.75V, place a short across R7 and leave R8 open.1.05V Output-Voltage Setting (VOUTC)The MAX17017D EV kit is shipped with FBC connected to resistors R9 and R10, which sets the VOUTC voltage to 1.05V.To change the output voltage to a value between 0.75V and 4V, remove R9. Calculate R9 using the following equation:R9 = R10 [(VOUTC/VFBC) - 1]where VFBC = 0.75V and R10 =10k Ω±1%. For an out-put voltage of 0.75V, place a short across R9 and leave R10 open.0.9V Output-Voltage Setting (VOUTD)The MAX17017D EV kit is shipped with FBD connected directly to the output voltage VOUTD. The voltage at FBD tracks the REFIND voltage. The REFIND voltage is set to 0.9V (half the output voltage at VOUTB) by resis-tor-dividers R22 and R23.To change the VOUTD output voltage to a value between 0.5V and 2V, remove R22. Calculate R22using the following equation:R22 = R23 [(VOUTB/VOUTD) - 1]where R23 =10k Ω±1%.MAX17017D Evaluation Kit 4_______________________________________________________________________________________Frequency Selection (FREQ) The switching frequency of the MAX17017D kit can be adjusted by removing resistor R24 and installing a short across resistor R20 or R21. As configured, the MAX17017D kit operates at 0.5MH z (VOUTA and VOUTC) and at 1MH z switching frequency (VOUTB).When changing the switching frequency, refer to theMAX17017 IC data sheet for the proper component selections and calculations for the inductors and output capacitors.Evaluates: MAX17017MAX17017D Evaluation Kit _______________________________________________________________________________________5E v a l u a t e s : M A X 17017MAX17017D Evaluation Kit 6_______________________________________________________________________________________Figure 1. MAX17017D EV Kit SchematicEvaluates: MAX17017MAX17017D Evaluation Kit_______________________________________________________________________________________7Figure 2. MAX17017D EV Kit Component Placement Guide—Component SideFigure 4. MAX17017 EV Kit PCB Layout—Layer 2Figure 3. MAX17017D EV Kit PCB Layout—Component SideFigure 5. MAX17017 EV Kit PCB Layout—Layer 3Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.8___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2008 Maxim Integrated Productsis a registered trademark of Maxim Integrated Products, Inc.E v a l u a t e s : M A X 17017MAX17017D Evaluation Kit Figure 6. MAX17017D EV Kit PCB Layout—Solder SideFigure 7. MAX17017D EV Kit Component Placement Guide—Solder Side。